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u in (-oo:+oo)
(4/3)*u = 1/2 // - 1/2
(4/3)*u-(1/2) = 0
(4/3)*u-1/2 = 0
4/3*u-1/2 = 0 // + 1/2
4/3*u = 1/2 // : 4/3
u = 1/2/4/3
u = 3/8
u = 3/8
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